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Mysterious messages : a history of codes and ciphers
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Can you crack the code?
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Top secret : a handbook of codes, ciphers, and secret writing
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Pass it on! : all about notes, from secret codes and special inks to fancy folds and dead man's drops
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The woman who smashed codes a true story of love, spies, and the unlikely heroine who outwitted America's enemies
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The woman who smashed codes : a true story of love, spies, and the unlikely heroine who outwitted America's enemies
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The woman who smashed codes a true story of love, spies, and the unlikely heroine who outwitted America's enemies
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The secret agent training manual : how to make and break top secret messages
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The code book how to make it, break it, hack it, crack it
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The code book :how to make it, break it, hack it, crack it
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Typing and keyboarding for everyone: 35 lessons to improve speed and accuracy
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The handwriting of American records for a period of 300 years
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Keyboarding made simple
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Mastering computer typing
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The secret of the skeleton key
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The haunted lighthouse
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The mummy's curse
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The mystery of the pirate's treasure
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Written by hand : techniques and tips to make your everyday handwriting more beautiful
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Enigma :the battle for the code
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The enigma girls : how ten teenagers broke ciphers, kept secrets, and helped win World War II
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You can't say that! : writers for young people talk about censorship, free expression, and the stories they have to tell
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Unbreakable : the spies who cracked the Nazis' secret code
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Censorship : what is it and how does it impact society?
